polar solvent


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polar solvent

[′pō·lər ′säl·vənt]
(materials)
A solvent in whose molecules there is either a permanent separation of positive and negative charges, or the centers of positive and negative charges do not coincide; these solvents have high dielectric constants, are chemically active, and form coordinate covalent bonds; examples are alcohols and ketones.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
integrifolia leaves and stem were shade dried and macerated with two polar solvents i.e.
3, this decreasing linear zone is observed, for association solvents and for polar solvents starting at least from 60[degrees]C, but is not observed for dispersion solvents.
Effect of annealing on phase transition in poly(vinylidene fluoride) films prepared using polar solvent. Bull Mater Sci, 34: 727-33.
Moreover, since p-TNC4 possesses nitro groups that may interact with these polar solvents and gives blue shifting in less polar solvents like CF, DCM.
Ethanol is also a polar solvent that forms hydrogen bonds with its solutes.
Here, we report that most of the > 500 commercially available plastic products that we sampled--even those that are presumably BPA free--release chemicals having detectable EA, especially if they are assayed by more polar and less polar solvents and exposed to common-use stresses.
For MW-assisted enzymatic reactions, the use of polar solvent is not preferable in order to avoid hot spots in the system, denaturation of enzymes and reduced reaction rates.
These results suggest that the PANI prepared by this method is easy to be dispersed and stabilized in water as well as polar solvent, by forming hydrogen bonds with a small amount of residual EG molecules which have also hydrogen bonding with water or the polar solvents.
SFC performs chromatographic separations by creating programmed composition gradients of methanol, or a less polar solvent, in carbon dioxide.
The highest extract yield was obtained by methanol-water one, so we conclude that the highest polar solvent was more efficient in extracting than the less polar solvents, this observation is in agreement with the results reported by some previous research [3,13].
To illustrate, precipitated silica dust readily disperses in water, a polar solvent, because the water easily wets the surface of each particle.